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United States Department of Agriculture

Agricultural Research Service

Research Project: MANAGING WATER AVAILABILITY AND QUALITY TO MAINTAIN OR INCREASE AGRICULTURAL PRODUCTION, CONSERVE NATURAL RESOURCES, AND ENHANCE ENVIRONMENT

Location: Coastal Plain Soil, Water and Plant Conservation Research

Title: Topographic effects on denitrification in drained agricultural fields

Authors
item Miller, Jarrod
item Lang, Megan -
item MCCARTY, GREGORY
item HUNT, PATRICK

Submitted to: Agronomy Society of America, Crop Science Society of America, Soil Science Society of America Meeting
Publication Type: Abstract Only
Publication Acceptance Date: June 28, 2012
Publication Date: July 30, 2012
Citation: Miller, J.O., Lang, M., Mccarty, G.W., Hunt, P.G. 2012. Topographic effects on denitrification in drained agricultural fields [abstract]. Agronomy Society of America, Crop Science Society of America, Soil Science Society of America Meeting. http://scisoc.confex.com/scisoc/2012am/webprogram/Paper73645.html.

Technical Abstract: Denitrification is affected by soil moisture, while soil moisture can be affected by topography. Therefore, denitrification can be spatially correlated to topographic gradients. Three prior converted fields on the Delmarva Peninsula were sampled spatially for denitrification enzyme activity. The upper six inches of soil were sampled from twenty points in each field. The spatial sites were selected randomly using Arc-GIS. Denitrification enzyme activity was performed in the lab using the acetylene inhibition method. The average pH, conductivity, and soil organic carbon were similar for each field, but average denitrification was greater in field H versus field B and field C. Further spatial analysis of denitrification within each field will be performed using the topographic wetness index.

Last Modified: 9/29/2014